The value of an hour of work around the world

Thanks to good.is, here's an infographic about the value of an hour of work around the world, as measured by the GDP per capita, and divided by the average number of hours worked in that country.

Luxembourg and Norway are the standouts, and the Scandinavian countries in general all doing well. I'm wondering if any readers have any insights as to what it is about Scandinavia that causes this pattern to emerge?